Precision Twist Drill 5997773 Cobalt Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5997773 is a No. 6 wire-size cobalt jobber-length drill bit engineered for heavy-duty drilling in steel and other ferrous and non-ferrous materials. The 135-degree split point with web thinning reduces the thrust required to start the hole and helps prevent walking on hard surfaces. At 3.75 inches overall length with a 2.5-inch flute length, this bit fits standard three-jaw chucks and meets ANSI and NAS 907 dimensional standards. The oxide and straw finish provides a degree of lubricity and surface protection during high-heat cutting operations. It is used primarily by machinists, tool-and-die workers, and maintenance technicians drilling in production or job-shop environments.

The 5997773 is suited for drilling steel, cast iron, aluminum, and other materials covered under workpiece material codes P, M, K, N, and S. The 12xD flute-to-diameter ratio and regular spiral flute geometry support efficient chip evacuation in through-hole and blind-hole applications. The straight cylindrical shank at 0.2040 inch diameter seats securely in hand drills, drill presses, and CNC machining centers. This bit is sold individually and is part of the R10CO-R15CO-R18CO series, which covers cobalt jobber-length drills in this size range.

Key Features

• No. 6 wire size, 0.2040 inch decimal diameter for precise hole sizing
• Cobalt high-speed steel construction for heat and wear resistance in hard materials
• 135-degree split point with web thinning reduces thrust and eliminates center-punch requirement on many surfaces
• Oxide and straw finish adds surface lubricity and corrosion resistance during cutting
• Regular spiral flute geometry with tapered web promotes consistent chip evacuation
• Meets ANSI and NAS 907 standards for dimensional accuracy and material specification

Compatibility

Part of the PRECISION TWIST DRILL R10CO-R15CO-R18CO cobalt jobber series. Designed for use in standard drill presses, hand drills, and CNC machining centers accepting a 0.2040-inch straight cylindrical shank. Suitable for drilling steel, cast iron, aluminum, and similar workpiece materials in general-purpose and heavy-duty production applications.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance professionals familiar with drill press or CNC machine operation. Secure the shank fully in the chuck and verify runout before beginning a cut. Do not exceed the recommended maximum drilling depth of 2.5 inches without retracting the bit to clear chips. Always wear appropriate eye protection and ensure the workpiece is properly fixtured before drilling.